Telephone dial lock



May 26, 1931.

l. GREENBERG Patented May 26, 1931 r fn.. d

IRVIN'G GREENBERG, OF BROOKLYN, NEW YORK l TELErHoNE DIAL LooxAppucatiqn mea Ndvember 30,1929; ser'iai iro."41o,719.

My present invention vrelates to thektelephone instruments equipped witha dial calling system and to a device for preventing the operation ofsaid dial. f y The main object of the invention is to provide a lockingVdevice that is easy to attach to a telephone instrument and that issimple to operate.

In carrying out my invention I provide a 1G supporting member carryingthe locking mechanismand having means for attaching to the telephoneinstrument, and a rotating armsupported on the above assembly, andarranged to engage a hole in the dial disk, and prevent its movement.,Figure 1 is a vertical longitudinal section through the device, takenon line 6-6 of Figures 2, 3 and 4, and showsv the key inrpo-y sition forunlocking. v

Figure 2`is aside elevation of the device as it is attached to atelephone instrument.

Figure 3 is a horizontal section through the device, taken on line`7-V-7of Figures 1,'

2 and 4 and shows its relation to the dial of the telephone instrument;V

' Figure 4 is a cross section, taken on line 8 8 of Figures land 3,showing the arm in the locking position. p

'Figure 5 is a cross section, taken on line 8`8 of Figure 1 and 3,showing the arm` 1n the unlocked position.

Y. The telephone instrument to which this" device is attached isindicated on the draw? 4ings byV dotted lines, and consists of thepedestal 9, the base 10, the dial support 11,

the dial 12, and the dial holes 13.

The locking device consists of a main supporting member 20, a latch 30,a lock 40, and `rotating arm 50. 4 The supporting member 20j has acylindrical depression 21 lined with the felt 22 and of such radius asto fit snugly around the telephone pedestal 9. 1

The projecting portion of member 2O is rounded to form in combinationwith the lock, a trunnion for the support of the rotating arm 50. l Aband 60 lined with felt 61 is provided .soto encircle the telephonepedestal 9, and is part of this recess -is iianfed as secured to thesupporting member 20 by the screws 62 and 63. f v

i The ends ofthis band'60' are arranged to lit underthe sleeve 51 of therotating arm, and are arranged so that'the end screw'62 is attachedduring the assembly of the 4de vice,` while the screw 63 isattached whenthe device is vappliedto the telephone'.

I For this purpose a cut 52 is made in the rotating arm sleeve 51inysuch -a' position that when the arm is unlocked'- as in Figure 5,this cut is opposite'the screw 63,and per--j mits its attachment; whenthe rotating armV is locked this cut 52is inthe position shown in Figure1, and it is therefore impossiblev to remove thedevice froml thetelephone;l

To allow securing the band v60, "under the sleeve 51, depressions 23 arelprovided at*` each side of supporting member 20. f Y

The free end of thek supporting member 2O is provided with vprojectinglugs 24, 25, and-'26'intended toact as spacers and iormv the latchhousing. `Aflatchl race 2 8, and spring housing 27 are alsoprovided inmember20.-'

The latch 30 is actuated by the expansion spring 31 engaging hole 32,fand is disen' gaged by theaction' of the lock' cam 41-on the flange33,l integral with latch 30, as shown in Figure 5. Y

The lock-shownffisof vthe standard pin tumbler type although it ispossible to use -with this device a slidingdiskor other type of lock. iv

This lock comprises-the customary, pin chambers and'pins 42,t herotating plug 43 to which issecured the cam 41 and key 44.

`This lock is vsecured to the supporting y member'20Qby the screws 45,46 and 47.

The arm is integral with the supportino' sleeve' 5 1, and rotates onthetrunion forme bylthe assemblyV of member 20 and lock 40.-

f The arm'q50 is -hollo'wed outv at 53 to form a'keeperf for thellatch30, Aand the" upper a at 54, toengage the end-v ofthec spring 56'.

The periphery y`of the projecting lugs 24, 25 and 26 is reduced so as toformla Ychannel for thespring 56.

Thisspring56 lis of thev expanding spiral efr3 'llor ythe position shownlondrawngs, with Etlaei arm 50 as shown by dotted lines at 57 ind ,A

- tal-'ofthe form With one end hooked over lug 25, and the other endhooked over flange 54, and is intended to bring armv to position whenunlocked.

A. projection 55 is provided at the side of the arm 50 designed toengage the top of the Support 20.

said arm 50.?1 The device as described and assembled When attached tothe telephone Will occupy arrest the rotation Aot the Figure 2.

n this position the telephone .dial can he used with periect freedom.

When it is desiredtolock the telephfene.j against unauthorized usersthearm 5012s@ turned down as Shown in Figures2, 3 and 4, when the extremeend 58. Willj enter the '20v hole- 13 of the dial 1 2 vand prevent itsrota.

tion.l

'I claim and desire 7^ I l is held by the latch 30, actuated by thespringl entering the depression 5.3. J

ofthearm'O,

To unlock the device, and release. the dial.

for use, the lgeygt is inserted -in the ylock 4Q,

and if it `isthe.proper key it will permit the plug 43 to turn;` 1

The plug 43 and the 11 cam Llfl attached thereto, is normally in theposition shown.' by dotted lines in Eigene e.,

Whenthe. earnl 4..1 's .turned showngiiI-lA Figure 5'r itv pressesagainst the ange 33. of the lateh 304 and Slides Seme ont of engagementwith the keeper 153 in arm 50 whehnnder the'expanding action ofthe..spiral spring 56. will swing np. to Vthe:pesi:f tion indicated in Figure5;.. 1 ...The device. as., Ashow-1.1 een ous metals, the lock may be anadaptation 'oi any one of several. k liielz'ejnt types/,the

details may be chan-ged tofrtvarious types.

Vof telephones Without changing 'the scope;l and plnposeofthisinvention.I therefore do not Wish tLQ-.be .re stri(ated y to the eXaet details"Yof construction 0r. see- 'tons shown or described.. Y

thns desenbedmy intention, achat;

entis:,lf y

.1- In a device of. the characterdescrrbed, the Combination with. adalftelephone. oa supporting member clamped to thepede's'tal 0f the.telephone. and disposed .alongsidego the. ela1.; an arm tforV engaging-and-loelnrig the. dial of the telephone mounted; rotatably nnen thesaid Supporting member: and mech# anem for lock-ing Landunloekngfithe..sia 1"d rotating arm torV the ,purposes 4Setd tenthy `herein.V

to the right as to secure by Letters:.Pati-`` Vvopeintion thereof.

'f,\.'3..-n.aloclrnfg dvi'celfor a telephone dial, a supportig memberclamped to the pedeslatohdisposed in a letohraeenpon, saidsuppfertilit.member' and: .engaging a keepers Within sad mening other' secured a: the-said supporting member having a' Calm for, actuating' the Qsafl 'latchto'. releasethe spring actuated looking .-arm. and .pemitlft to:- rotateto'. Ia verticalV position; Yfecllgi th@ ephone to form a trunnion forka. dial loclgingarmspring actuated and rotat- .ablyD mounted '"tlereonja spring y actuated telephone dial foi its normal use "and megh- 34.-.Inaioeieegdevi fer'a'tdeahondial,

a j supporting membersecuredftd the .tele-A phone. pedestal Y and'fdisposedfalongside .OQ the dial havingmeas for'Clllllllg" 13.0 saidpedestal vand prevent. thefremoval' ott-he4 Cleyiceuhen the dial islocked an' arm .rotatl ably mounted' upon said supporting. memberVthrough. .an integral sleeve' entirely enGlQse' ing" the mechanismrtherein;A` al .Spring dis-l' posed Whnsaidsleeve tirriontainthesaiiderIn inL avetrealrpesteni; a leek. seeilredv to saidsupporting memberand disposed Within' said.' rotatinaeleeve; e oenill'eetneed by.

said. lock and arranged to' engagey la Spring actuated latch dis`p'ofs ei,"l.Within sfaid .s.u}` ,V porting member.;l .a keeper provided wtfhr/the rotatngarln afranged'te be engagedby. said latch"vvhen Vsaid armi's'rotated 'into endial to pre-.vent :the rotetenof sed'dal.; and... meansfor actuating uthe" l' c'. l; yand; lath 1D0,

' gagelnent With a finger hole otheitelephone releaseethe V rotating armfor returnv tothe verticali position and .permit fthe' "normaloperation?'ofithe'telephone dial.'

2. In a device of, fhal'actlf' described;

the eombnationwith a dialltelephone etfa supporting member. damped tothe :pedestaki of the telephone and disposed alongsidegthej dial thereof5; a rotating armvmeimted .upon

